| 摘要 |
PROBLEM TO BE SOLVED: To provide a system time clock which reduces jitter by controlling a PCR with a received program clock reference PCR, a system time clock STC at the time of receiving, the cycle in an encoding device output of a transport stream packet, a packet transfer time in a device input and tolerance as specific relations. SOLUTION: In an encoding device output of a transport stream packet of an MPEG signal, a cycle is T, a packet transfer time in a device input is δand a tolerance is Δ. PCR jitter is reduced by correcting a PCR to PCR-(T-δ) when |PCR-STC|>T-δ-Δ is true and also sign (PCR-STC)>0 is true, correcting the PCR to PCR+(T-δ) when |PCR-STC|>T-δ-Δ is true and also sign (PCR-STC)>0 is false and not correcting the PCR when |PCR-STC|>T-δ-Δ is false. |
